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GB 5310-2008, seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines

GB 5310-2008, seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines

GB 5310- 2008 is a national standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, test rules, packaging, mark and quality certificate.

GB 5310- 2008 standard is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.

20MnG-Seamless-pipe

20MnG high pressure boiler pipe is a high manganese carbon carburizing steel, the hardenability, strength and plasticity than 20 steel cutting performance also improved, good low temperature impact toughness and weldability. Used to manufacture camshafts, gears, couplings, hinges, pin towbar, crankshaft bearing rings.

High pressure boiler pipe is a boiler tubes are seamless steel pipe category. The method of manufacturing seamless pipes is the same, but there are strict requirements for steels used in manufacturing of tube. High pressure boiler tubes when used often in high temperature and high pressure conditions, under the action of the tube in the high temperature flue gas and water vapor will occur oxidation and corrosion. Steel pipe with high rupture strength, high resistance to oxidation corrosion and good organizational stability. High pressure boiler tube is mainly used to make high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, windpipe, main steam pipe.

高压锅炉管GB5310-2008是用于制造各种结构低高压锅炉过热蒸汽管、沸水管及机车锅炉用过热蒸汽管、大烟管、小烟管和拱砖管用的优质碳素结构钢热轧和冷拔(轧)无缝钢管。 GB5310-2008《高压锅炉用无缝钢管》的规定。
外观质量:钢管内外表面不允许有裂缝、折叠、轧折、结疤、离层和发纹。
这些缺陷应完全清除掉。清除深度不得超过公称壁厚的负偏差,其清理处实际壁厚不得小于壁厚所允许的最小值。

主要钢级牌号

20G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG,12Cr2MoWVTiB.
(经协商,也可供应其他特殊牌号的钢管)

Chemical Compositions(%) of GB 5310-2008:

Steel grade C Si Mn P S Cr Mo
20G 0.17-0.24 0.17-0.37 0.35-0.65 ≤0.030 ≤0.030 ≤0.25 ≤0.15
20MnG 0.17-0.24 0.17-0.37 0.70-1.00 ≤0.030 ≤0.030 ≤0.25 ≤0.15
25MnG 0.18-0.24 0.17-0.37 0.80-1.10 ≤0.030 ≤0.030 ≤0.25 ≤0.15
15CrMo 0.12-0.18 0.17-0.37 0.40-0.70 ≤0.030 ≤0.030 0.80-1.10 0.40-0.55
12Cr2MoG 0.08-0.15 ≤0.50 0.40-0.70 ≤0.030 ≤0.030 2.00-2.50 0.90-1.20
12Cr1MoV 0.08-0.15 0.17-0.37 0.40-0.70 ≤0.030 ≤0.030 0.90-1.20 0.25-0.35
12Cr2MoWVTiB 0.08-0.15 0.45-0.75 0.45-0.65 ≤0.030 ≤0.030 1.60-2.10 0.50-0.65
10Cr9Mo1VNb 0.08-0.12 0.20-0.50 0.30-0.60 ≤0.020 ≤0.010 8.00-9.50 0.85-1.05
Steel Grade Cu Ni V Al W Ti Nb
20G ≤0.20 ≤0.25 ≤0.08
20MnG ≤0.20 ≤0.25 ≤0.08
25MnG ≤0.20 ≤0.25 ≤0.08
15CrMo ≤0.20 ≤0.30
12Cr2MoG ≤0.20 ≤0.30
12Cr1MoV ≤0.20 ≤0.30 0.15-0.30
12Cr2MoWVTiB ≤0.20 ≤0.30 0.28-0.42 0.30-0.55 0.08-0.15 B 0.002-0.008
10Cr9Mo1VNb ≤0.20 ≤0.40 0.18-0.25 ≤0.015 0.06-0.10

Mechanical Properties of GB5310-2008:

Steel Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
20G 410-550 245 24
20MnG415 240 22
25MnG485 275 20
15MoG 450-600 270 22
12CrMoG 410-560 205 21
12Cr2MoG 450-600 280 20
12Cr1MoVG 470-640 255 21
12Cr2MoWVTib 540-735 345 18
10Cr9Mo1VNb ≥585 ≥415 ≥20

The W.T. tolerance of GB5310-2008:

W.T.(S) Tolerance of W.T.
<3.5  +15%(+0.48mm min)
 -10%(+0.32mm min)
3.5-20 +15%,-10%
>20 D<219 ±10%
D≥219 +12.5%,-10%

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